ANALYTICAL KEYS 



TO THE 



GENERA AND SPECIES 



Fresh Water Alg^ 



The iJesmidieae of the Tnited States, 



KOUNUEIJ l)N THE CLASSIFICATION OF 



THE REV. FRANCIS WOLI-E'S MONOGRAPHS, 



DR. ALFRED C. STOKES, 



Author of "Microscopy for Beginners;" "A Contribution toward 



a Natural Histor\' of the Fresh Water Infusoria 



of the Lfnited States," etc. 



PORTLAND, CONN.: 



ElJWARD F. BiGELOW, PUBLISHER. 



'893. 



